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Table 1 The criteria list of quality score for included studies

From: The associations between interleukin-17 single-nucleotide polymorphism and colorectal cancer susceptibility: a systematic review and meta-analysis

Criterion Score
Representativeness of cases
 Selected from population or cancer registry 3
 Selected from hospital 2
 Selected from pathology archives, but without description 1
 Not described 0
Source of controls
 Population based 3
 Blood donors or volunteers 2
 Hospital based (cancer-free patients) 1
 Not described 0
Case-control match
 Matched by age and gender 3
 Not matched by age and gender 0
Specimens used for determining genotypes
 White blood cells or normal tissues 3
 Tumor tissues or exfoliated cells of tissue 0
Hardy–Weinberg equilibrium (HWE)
 Hardy–Weinberg equilibrium in control subjects 3
 Hardy–Weinberg disequilibrium in control subjects 0
Total sample size
 > 1000 3
 > 500 and < 1000 2
 > 200 and < 500 1
 < 200 0